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path: root/drivers/bluetooth/hci_ldisc.c
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Diffstat (limited to 'drivers/bluetooth/hci_ldisc.c')
-rw-r--r--drivers/bluetooth/hci_ldisc.c40
1 files changed, 35 insertions, 5 deletions
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index 2edd30556956..8397b716fa65 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -114,8 +114,12 @@ static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
struct sk_buff *skb = hu->tx_skb;
if (!skb) {
+ read_lock(&hu->proto_lock);
+
if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
skb = hu->proto->dequeue(hu);
+
+ read_unlock(&hu->proto_lock);
} else {
hu->tx_skb = NULL;
}
@@ -125,18 +129,23 @@ static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
int hci_uart_tx_wakeup(struct hci_uart *hu)
{
+ read_lock(&hu->proto_lock);
+
if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
- return 0;
+ goto no_schedule;
if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
- return 0;
+ goto no_schedule;
}
BT_DBG("");
schedule_work(&hu->write_work);
+no_schedule:
+ read_unlock(&hu->proto_lock);
+
return 0;
}
EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup);
@@ -237,9 +246,13 @@ static int hci_uart_flush(struct hci_dev *hdev)
tty_ldisc_flush(tty);
tty_driver_flush_buffer(tty);
+ read_lock(&hu->proto_lock);
+
if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
hu->proto->flush(hu);
+ read_unlock(&hu->proto_lock);
+
return 0;
}
@@ -261,10 +274,15 @@ static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
skb->len);
- if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
+ read_lock(&hu->proto_lock);
+
+ if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
+ read_unlock(&hu->proto_lock);
return -EUNATCH;
+ }
hu->proto->enqueue(hu, skb);
+ read_unlock(&hu->proto_lock);
hci_uart_tx_wakeup(hu);
@@ -460,6 +478,8 @@ static int hci_uart_tty_open(struct tty_struct *tty)
INIT_WORK(&hu->init_ready, hci_uart_init_work);
INIT_WORK(&hu->write_work, hci_uart_write_work);
+ rwlock_init(&hu->proto_lock);
+
/* Flush any pending characters in the driver */
tty_driver_flush_buffer(tty);
@@ -475,6 +495,7 @@ static void hci_uart_tty_close(struct tty_struct *tty)
{
struct hci_uart *hu = tty->disc_data;
struct hci_dev *hdev;
+ unsigned long flags;
BT_DBG("tty %p", tty);
@@ -490,7 +511,11 @@ static void hci_uart_tty_close(struct tty_struct *tty)
cancel_work_sync(&hu->write_work);
- if (test_and_clear_bit(HCI_UART_PROTO_READY, &hu->flags)) {
+ if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
+ write_lock_irqsave(&hu->proto_lock, flags);
+ clear_bit(HCI_UART_PROTO_READY, &hu->flags);
+ write_unlock_irqrestore(&hu->proto_lock, flags);
+
if (hdev) {
if (test_bit(HCI_UART_REGISTERED, &hu->flags))
hci_unregister_dev(hdev);
@@ -549,13 +574,18 @@ static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
if (!hu || tty != hu->tty)
return;
- if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
+ read_lock(&hu->proto_lock);
+
+ if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
+ read_unlock(&hu->proto_lock);
return;
+ }
/* It does not need a lock here as it is already protected by a mutex in
* tty caller
*/
hu->proto->recv(hu, data, count);
+ read_unlock(&hu->proto_lock);
if (hu->hdev)
hu->hdev->stat.byte_rx += count;